Don't make lots of virtual calls in shadowPseudoId
Don't make lots of virtual calls in shadowPseudoId

shadowPseudoId() doesn't need to be virtual anymore and it should not
call part() more than once since that's also virtual.

Review URL: https://codereview.chromium.org/35563002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160238 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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